Add mode parameter to wrapSource

Signed-off-by: Julius Härtl <jus@bitgrid.net>

Author: juliusknorr

src/WrapperHandler.php

@@ -57,7 +57,7 @@ private static function buildContext($protocol, $context, $source) {
 	 * @param string|null $class deprecated, class is now automatically generated
 	 * @return bool|resource
 	 */
-	protected static function wrapSource($source, $context = [], $protocol = null, $class = null) {
+	protected static function wrapSource($source, $context = [], $protocol = null, $class = null, $mode = 'r+') {
 		if ($class === null) {
 			$class = static::class;
 		}
@@ -72,7 +72,7 @@ protected static function wrapSource($source, $context = [], $protocol = null, $
 			if (self::isDirectoryHandle($source)) {
 				return opendir($protocol . '://', $context);
 			} else {
-				return fopen($protocol . '://', 'r+', false, $context);
+				return fopen($protocol . '://', $mode, false, $context);
 			}
 		} finally {
 			stream_wrapper_unregister($protocol);